DevForce Community Forum : NullReferenceException, DatasourceKeyName, EntityManager DataSourceResolver http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2010 : NullReferenceException, DatasourceKeyName, EntityManager DataSourceResolver Sat, 11 Apr 2026 04:31:42 -700 Wed, 21 Mar 2012 19:27:40 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=3339 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ NullReferenceException, DatasourceKeyName, EntityManager DataSourceResolver : Thanks for the clarifications... http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=13056#13056 Author: DenisK
Subject: 3339
Posted: 21-Mar-2012 at 7:27pm

Thanks for the clarifications sebma. This defect has been fixed and will be included in 6.1.7 release.]]> Wed, 21 Mar 2012 19:27:40 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=13056#13056 NullReferenceException, DatasourceKeyName, EntityManager DataSourceResolver : Typo Correction: SomeNonExistentTypeInDomainModel... http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12996#12996 Author: sebma
Subject: 3339
Posted: 15-Mar-2012 at 7:30pm

Typo Correction:
SomeNonExistentTypeInDomainModel - is just any class in your project, like String, which is NOT one of those concrete entity classes.]]> Thu, 15 Mar 2012 19:30:55 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12996#12996 NullReferenceException, DatasourceKeyName, EntityManager DataSourceResolver : SomeNonExistentTypeInDomainModel... http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12995#12995 Author: sebma
Subject: 3339
Posted: 15-Mar-2012 at 7:29pm

SomeNonExistentTypeInDomainModel - is just any class in your project, like String, which is one of those concrete entity class.
 
Fact is, it seems as long as no query or save operation is made via EntityManager, the DataSourceKeyName could be null, which is dangerous.
 
Thanks for your clarifications.
-Seb
]]> Thu, 15 Mar 2012 19:29:27 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12995#12995 NullReferenceException, DatasourceKeyName, EntityManager DataSourceResolver : Just to clarify the following... http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12994#12994 Author: DenisK
Subject: 3339
Posted: 15-Mar-2012 at 5:58pm

Just to clarify the following code:

StoredProcQuery query = new StoredProcQuery(typeof(int), "DummyNonExistentSP");
em.ExecuteQuery(query); // throws NullReferenceException

The exception thrown here is not due to the StoredProc not existing. It's due to its DataSourceKeyName being null. Below are working and non working examples.

StoredProcQuery query1 = new StoredProcQuery(typeof(int), "ExistingSpInYourModel");
em.ExecuteQuery(query1);	//Throws NullRefException - DataSourceKeyName not set

StoredProcQuery query2 = new StoredProcQuery(typeof(int), "DummyNonExistentSP");
query2.DataSourceKeyName = "YourDsKeyHere";	//DataSourceKeyName is set but........
em.ExecuteQuery(query2);	//Throws System.InvalidOperationException: The FunctionImport could not be found

StoredProcQuery query3 = new StoredProcQuery(typeof(int), "ExistingSpInYourModel");
query3.DataSourceKeyName = "YourDsKeyHere";
em.ExecuteQuery(query3);	//Now this works.
]]> Thu, 15 Mar 2012 17:58:47 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12994#12994 NullReferenceException, DatasourceKeyName, EntityManager DataSourceResolver : Hi sebma,Thank you for the feedback.... http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12993#12993 Author: DenisK
Subject: 3339
Posted: 15-Mar-2012 at 12:47pm

Hi sebma,

Thank you for the feedback. It is expected but you're correct in that the exception message is not helpful. I'll file a bug report for this.

In the meantime, could you post the definition of your SomeNonExistentTypeInDomainModel?
]]> Thu, 15 Mar 2012 12:47:23 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12993#12993 NullReferenceException, DatasourceKeyName, EntityManager DataSourceResolver : Hi, This got to do... http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12989#12989 Author: sebma
Subject: 3339
Posted: 15-Mar-2012 at 1:01am

Hi,
 
This got to do with EntityManager's DataSourceResolver.DataSourceKeyNames being empty on startup.
 
System.NullReferenceException: Object reference not set to an instance of an object. at IdeaBlade.EntityModel.DataSourceResolver.GetDataSourceKey(Type entityType) at IdeaBlade.EntityModel.EntityManager.CreateEntityGroupAndInitialize(Type entityType) at IdeaBlade.EntityModel.EntityManager.GetEntityGroup(Type entityType)
 
Just do the following:
 
SomeDomainModelEntityManager em = new SomeDomainModelEntityManager();
em.GetEntityGroup(typeof(SomeNonExistentTypeInDomainModel)); // throws NullReferenceException
StoredProcQuery query = new StoredProcQuery(typeof(int), "DummyNonExistentSP");
em.ExecuteQuery(query); // throws NullReferenceException
 
Not sure if this is expected, even if it is, the exception type really not helpful.
 
]]> Thu, 15 Mar 2012 01:01:21 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3339&PID=12989#12989